Where is the deepest known point in the ocean?

The deepest known point in the ocean is the Challenger Deep, located in the Mariana Trench in the western Pacific Ocean, east of the Mariana Islands. It has been measured at about 10,900 to 11,000 meters deep, depending on the survey method used. The trench lies along a subduction zone where one tectonic plate is forced beneath another. Because of the extreme pressure, this environment is one of the least accessible places on Earth. Human and robotic dives there have helped scientists study deep-sea geology and life under crushing conditions.